Continuity mistake: When Wilee is getting away from bobby at the campus, the position of the sun changes between shots.
Continuity mistake: Just after Bobby shouts "Close the doors!", an officer tells a mechanic named Angus to stop Vanessa. In one shot, Angus steps off the car ready to grab her, but in the next shot, Angus goes to step off the car a second time. (01:11:50)
Continuity mistake: When Wilee collides with the taxi, he is sent into the air. During the slow-mo shot, as he shoots to the right of screen, one arm is raised and one arm is lowered. The next shot however shows both arms raised in the air. (01:00:15)
Continuity mistake: At the start of the scene where Wilee chases Manny, the wide shot shows them to be riding on the left side of the road. The shot cuts to a view of the ground where they are now riding on the right side of the road. (00:53:05)
Continuity mistake: A few seconds after Mr. Leung gives Nima a number card, he asks "This money is for a snakehead?" As he says this, his arm is resting freely. He doesn't move his arm in the following reverse angle, but his arm is suddenly resting on the chair when the camera cuts back to him. (00:39:55)
Continuity mistake: As Bobby chases Wilee, they both go under a bridge and Bobby says "I'm chasing a bicycle." After this line, they drive past the exact same Mobil gas station three times. (00:14:40)
Continuity mistake: When Bobby catches up to Wilee, he ends up having to stop at a traffic light. The two cars in front of his car are a blue car and a silver car about to park onto a curb. Yet from a wide angle, the car parking on the curb is now black, and there are no blue cars in sight. (00:14:10)
Continuity mistake: Whilst riding through New York at 5:17pm, Wilee drives past a silver Ford. As he does this, a taxi is visible behind it. But when the shot cuts, the taxi has suddenly become a black car. (00:07:50)
Continuity mistake: When Wilee phones Manny early on in the movie, Wilee unlocks the chain to his bike and the bike and chain fall to the floor. Wilee then picks up the chain and doesn't pick up the bike. But by the time he finishes the call with Manny, the bike is now back to being laid against the tree, when it was on the ground moments earlier. (00:05:00)
Chosen answer: I think that sound is the front wheel giving way. If you look closely, you can see that his front wheel is wobbling a little as he escapes. This may be why he ditches his bike and steals the cop's bike soon after.